But confirming his change of heart at a press conference ahead of the Irish Open this week, he said Brazil's hosting of the World Cup had provoked his declaration.

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"I've been thinking about it a lot," he told reporters at the Fota Island Resort. "I feel like it's the right decision for me. There's no point in delaying it and letting it linger any longer.

"I don't know whether it's been because the World Cup has been in Brazil and I've been thinking a couple of years down the line.

"I have also thought about all the times that I played as an amateur for Ireland and as a boy and everything so for me it's the right decision to play for Ireland, so I'm going to play for Ireland in 2016.

"If you look at the (Irish) rugby players, you look at cricketers or hockey players ... they view Ireland as one, the same as we do in golf.

"So I don't think there's any point to change that or any point to go against that just because it's a different event or it's the Olympics.

"I was always very proud to put on the Irish uniform and play as an amateur and as a boy, and I would be very proud to do it again."

McIlroy, from Holywood in County Down, played amateur golf on an all-island basis before he turned professional and is eligible to represent Great Britain and Northern Ireland as well as the Republic of Ireland.

The U.S. Open and U.S. PGA Championship winner received funding from the Golfing Union of Ireland before turning professional in 2007.

Hey @united landed in Dublin yesterday morning from Newark and still no golf clubs... Sort of need them this week... Can someone help!?

And he has represented Ireland twice in golf's World Cup event, both times playing alongside compatriot Graeme McDowell -- the 2010 U.S. Open champion.

When asked if an Olympic gold medal would rank as highly as a major championship he replied: "Winning an Olympic medal is still is not as big as a major championship but it's up there.

"The majors in our sport are the biggest and best prizes in the game. But as hopefully golf grows in the Olympics and becomes say bigger in four or five Games down the line then it might become bigger."

Aside from the 2016 Olympics, McIlroy's more immediate concern was getting his clubs back after they were lost in transit by United during his flight to Ireland.

The world No. 6 tweeted on Tuesday: "Hey @united landed in Dublin yesterday morning from Newark and still no golf clubs... Sort of need them this week... Can someone help!?"